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Date:   Wed, 11 Jul 2018 22:48:31 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net-next] net/sched: flower: Fix null pointer
 dereference when run tc vlan command

From: Jianbo Liu <>
Date: Mon,  9 Jul 2018 02:26:20 +0000

> Zahari issued tc vlan command without setting vlan_ethtype, which will
> crash kernel. To avoid this, we must check tb[TCA_FLOWER_KEY_VLAN_ETH_TYPE]
> is not null before use it.
> Also we don't need to dump vlan_ethtype or cvlan_ethtype in this case.
> Fixes: d64efd0926ba ('net/sched: flower: Add supprt for matching on QinQ vlan headers')
> Signed-off-by: Jianbo Liu <>
> Reported-by: Zahari Doychev <>


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